By one definition, the GOP baseball shooting is the 154th mass shooting this year

The attack Wednesday in Alexandria, Va., is the 154th mass shooting this year, according to the Gun Violence Archive, a nonprofit organization that tracks information on shootings in the United States. On 165 days through the calendar year, that averages out to a little less than one mass shooting per day.

The archive considers an incident a mass shooting if four or more people are shot, not including the shooter. Some definitions are broader: If the shooter is included in the tally, the number of mass shootings rises to 195. Some, however, are much more narrow: If a mass shooting is defined as four or more victims killed in a public location, excluding robberies and gang violence, the number falls to four.

Using the Gun Violence Archive's definition, the number of mass shootings has been ticking upward in recent years: Through June 14, there were 100 mass shootings in 2014, 135 in 2015, 142 last year and 154 this year.